Female:
Taiwan (Hetalia, manga) - tanned
Seychelles (Hetalia, manga... I guess?) Her skin tone seems to change each time she's drawn, but she is an African nation, so probably medium or dark
Other African nations, including Kenya, Uganda, Zimbabwe, Botswana, and Ghana, all of dark skintone, who can be seen in the concept art for the hetalia game. So I guess manga?